Alias .exit to .quit in the repl

[nicolo-ribaudo]

For some reason I always write .quit, then I get the Invalid REPL keyword error, and then remember "oh right, it's .exit". If the REPL accepted both to exit, it would be ideal.

It doesn't feel 100% right to start a discussion for this very minor annoyance I have, but maybe many other people have the same problem 😁.